Polycrystalline lead iodide films for digital X-ray sensors

Structural changes during vapor-phase deposition of polycrystalline-PbI2 films

“…Lead iodide (PbI 2 ) is a promising material for application as a direct converter for detection of ionizing radiation and digital X-ray imaging [1,2]. The material is a wide bandgap semiconductor (E g ¼ 2.3À2.55 eV) with high molecular weight (461 g/mol) and resistivity of about 10 13 O cm.…”

Amorphous lead oxide (a-PbO): suppression of signal lag via engineering of the layer structure

“…The presence of a residual signal limits the application of these materials to static imaging (for instance, radiography), while the needs of vitally-important real-time imaging, like fluoroscopy, are left unmet. Interestingly, other polycrystalline high-Z (atomic number) materials that have also been considered for applications as radiation detectors (including polycrystalline layers of PbI 2 , HgI 2 , and poly-PbO 19 – 23 ) are all suffering from the same problem, i.e. signal lag.…”

Properties of solution grown PbI2 layers embedded in PVA

“…In addition to optical applications, PbI 2 single crystals can be used for room temperature X or γ-ray detection thanks to the wide band gap and high atomic number of the material. On the other hand, polycrystalline PbI 2 can be a candidate for the photoconductor layer in active matrix X-ray imaging devices [2]. Various methods are being investigated for the deposition of polycrystalline films up to 100 µm thick.…”

“…The most usual is physical vapour deposition (PVD) which has already given encouraging results [3]. Small crystallites (a few micrometers in size) randomly distributed are formed by this method [2]. One possible drawback of PVD is concerned with the risk of PbI 2 decomposition [4].…”